English verb conjugation COULD STEM

Regular verb: stem - stemmed - stemmed

Affirmation

Simple form

I could stem
you could stem
he could stem
we could stem
you could stem
they could stem

V-ing form

I could be stemming
you could be stemming
he could be stemming
we could be stemming
you could be stemming
they could be stemming

Perfect

I could have stemmed
you could have stemmed
he could have stemmed
we could have stemmed
you could have stemmed
they could have stemmed

V-ing perfect

I could have been stemming
you could have been stemming
he could have been stemming
we could have been stemming
you could have been stemming
they could have been stemming

Negation

Simple form

I couldn't stem
you couldn't stem
he couldn't stem
we couldn't stem
you couldn't stem
they couldn't stem

V-ing form

I couldn't be stemming
you couldn't be stemming
he couldn't be stemming
we couldn't be stemming
you couldn't be stemming
they couldn't be stemming

Perfect

I couldn't have stemmed
you couldn't have stemmed
he couldn't have stemmed
we couldn't have stemmed
you couldn't have stemmed
they couldn't have stemmed

V-ing perfect

I couldn't have been stemming
you couldn't have been stemming
he couldn't have been stemming
we couldn't have been stemming
you couldn't have been stemming
they couldn't have been stemming

Interrogative form

Simple form

could I stem?
could you stem?
could he stem?
could we stem?
could you stem?
could they stem?

V-ing form

could I be stemming?
could you be stemming?
could he be stemming?
could we be stemming?
could you be stemming?
could they be stemming?

Perfect

could I have stemmed?
could you have stemmed?
could he have stemmed?
could we have stemmed?
could you have stemmed?
could they have stemmed?

V-ing perfect

could I have been stemming?
could you have been stemming?
could he have been stemming?
could we have been stemming?
could you have been stemming?
could they have been stemming?

Interro-negative form

Simple form

couldn't I stem?
couldn't you stem?
couldn't he stem?
couldn't we stem?
couldn't you stem?
couldn't they stem?

V-ing form

couldn't I be stemming?
couldn't you be stemming?
couldn't he be stemming?
couldn't we be stemming?
couldn't you be stemming?
couldn't they be stemming?

Perfect

couldn't I have stemmed?
couldn't you have stemmed?
couldn't he have stemmed?
couldn't we have stemmed?
couldn't you have stemmed?
couldn't they have stemmed?

V-ing perfect

couldn't I have been stemming?
couldn't you have been stemming?
couldn't he have been stemming?
couldn't we have been stemming?
couldn't you have been stemming?
couldn't they have been stemming?

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